Valve's multiplayer-centric zombie shooter Left 4 Dead 2 has sold "over 2 million retail copies" worldwide since it released on November 17, the developer said today.
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"[Left 4 Dead 2] appears to be on target to become one of the top selling Xbox [360] and PC titles for the month of November," reads an announcement sent out by Valve. As the above figure only details sales of physical retail copies, the numbers do not include copies of the game sold through Valve's PC digital distribution platform Steam.

The company added that "sales to date are more than double the original [Left 4 Dead]" and that L4D2 has "already been played by over 1 million Xbox LIVE Gold account holders," with word that "news regarding L4D2 DLC 1 is coming very soon."